To be fair, in a non-sex scene, or maybe aftercare, I could easily see a couple cuddling and one playfully nibbling at the others neck in affection.
Plus, I've seen people do that before (ever heard of a hickey?) and I think certain animals bite their partner's neck when mating as a sign of dominance or something like that.
Trust me, someone somewhere somehow has an alliteration fetish. Also, sometimes eloquence adds to sex. Usually it's forcibly removing the eloquence via toe-curling orgasms that's hot, but the fancy vocabulary has some merit in and of itself.
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